Process and apparatus for dispersing and concentrating light.



C. L. REDFIELD. PROCESS AND APPARATUS FOR DISPERSING AND CONCEN RATING LIGHT. APPLICATION FILED APR. 6, I914.

1 $202,223 Patented Oct. 24, 1916.

CASPER I4. REDFIELD, F CHICAGO, ILLINOIS.

' PROCESS AND APPARATUS FOR DISPE'BSING AND CONCENTRATING LIGHT.

Specification of Letters Patent.

Patented Oct. 24, 1916.

Application filed April 8, 1914. Serial 110. 829,817.

To all'whom it may concern:

Be it known that I, CASPER L. REDFIELD, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Processes and Apparatus for Dispersing and Concentrating Light, of which the following is a specification. a

My invention relates to the dispersion and reconoentration of light, and has for its object the production of a process of and ap aratus for concentrating at particular Foci large quantities of light having similar wave lengths.

In the accompanying drawings, the annular (toroidal) lens 1 is secured to a shaft 2 by means of clamping nuts 3 and 4. The simple lens shown will be assumed to be an achromatic lens as the manner of making an achromatic combination is well known and need not be here described.

Screwed upon the shaft 2 is a disk 5 which carries an annular collimating lens 6, the diameter of which is equal to the toric diameter ,of the lens 1. Ajam nut 7 serves to secure the disk 5, and consequently the lens 6, at any desired adjustment with respect to the lens 1. Also secured to the disk 5 by means of a ring 8 is an annular prism 9 located directly beneath the lens 6. A disk 10 is adjustable on the threads of the shaft 2 and is secured in any desired position by the jam nut 11. Just outside of the disk 10, and carried thereby, is a ring 12,v the disk and ring together furnishing a narrow annular slit 13.

Parallel rays of light falling upon the upper face of the lens'l are concentrated in a ring uponthe lens 6, which brings them to parallelism and projects them in the form of a tubular beam of light upon the prism 9. The prism disperses the light and at the same time converges rays of difi'erent colors at difierent foci on the axis OO Thus, all of the violet rays contained in the light falling upon the lens 1 will be separated from the other rays and will be focused at the point V. Similarly, the blue rays will be concentrated at B, the yellow rays at Y, the red rays at R, and rays of other colors at intermediate points. 7

By adjusting the disk 10 downward on the shaft 2 until the slot 13 registers with the conical beam of any particular color, all other light will be screened and only light of that particular wave length will be concentrated on the axis OO Any object placed at the apex of this cone will then be sub1ected to intense light of a particular.

persed light to a series of foci, all the light of each color being directed to the same focus.

3. In a light dispersing and concentrating apparatus, a. curved prism arranged to disperse light and to concentrate the dispersed rays at different foci.

4. In a light dispersing and concentrating apparatus, an annular lens, and means for dispersing the light passing through said lens and concentrating the rays of different colors at different points.

5. A light dispersing and concentrating apparatus consisting of an annular lens, an annular collimator, an annular prism, and means for supporting the several devices in operative relationship to each other.

6. A light dispersing and concentrating apparatus consisting of an annular lens, an annular collimator, an annular prism, and means for'adjusting the collimator with respect to the lens.

7 The combination with an annular prism, and means for projecting an annular beam of light thereon, of a screen for intercepting part of the light passing through said prism.

8. A light dispersing and concentrating apparatus consisting of means for concentrating a large quantity of mixed light within a small compam, and means for dispersing the concentrated light, said dispersing means being so arranged as to concentrate the rays of-each color at a different focus,

9. Means for concentrating a large quanarranged to concentrate the light of different tity oflight into a thin and parallel beam colors at different foci. 10 having great length in a direction perpen- Signed at Chicago, Illinois, this 4th day dicular to the direction of propagation of April, 1914.

5 of the light, and a, dispersing device upon CASPER L. REDFIELD. which the beam falls, said dispersing device Witnesses: v having a length corresponding to the per- JAMES C. Rnnrmnn,

pendicular length of the beam and being WALTER H. REDFIELD. 

